Seems to do nowt for a couple of years then suddenly it's everywhere
When the pods are ripe ,go along with a plastic bag, put it over each pod and touch the pod with the inner surface of the bag . It will explode with a pop! if properly ripe . Do this with as many as you like and you'll soon have a bag full of seed .
No need to dry it fridge or anything else it .
Should it accidentally get scattered around it will spring into life next year !
It will spread naturally as the popping is it's strategy for maximising the distance from plant to seedling !
John